Driving and stopping mechanism.



A. R. SCHOENKY.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED AUG|1B I9I5- 1,265,529. Patented May 7,1918.

3 $HEET$SHEETI A. R. SCHOENKY.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED AUG. 1B. 1916.

1,265,529a Patented May '7, 1918.

zym'fi 3 SHEETSSHEET 2.

A. R. SCHOENKY.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED AUG.I8. I916.

Patented May 7,1918.

3 SHEETSSHEET 3.

AUGUST R. SCHOENKY, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO IREECE'SHOE MACHINERY COMPANY, 013 BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

DRIVING AND STOPPING MECHANISM.

Specification of Letters Patent.

Patented May 7,1918.

Application filed August 18, 1916. Serial No. 115,912.

To all whom it may concern Be it known that 1, AUGUST R. Sorronn KY, a citizen of the United States of America, and a resident of Somerville, county of Middlesex, and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Driving and Stopping Mechanisms, of which the following is a specification.

This invention relates to driving and stopping mechanism for high speed power driven machines and is of particular value in connection with that class of machines that must be started and stopped at very frequent intervals during the operation thereof.

One object of this invention is to produce a driving and stopping mechanism that is simple and effective in construction .and positive in its action. In certain classes of machines, such for instance as sewing machines, it is desirable and in fact necessary, for the best results, to cause the stoppage of the machine at a time when the needle is out of the work, in order that the operator may remove therefrom the completed work, and present new work thereto.

This is a time saving requirement and necessitates the stoppage of the driven shaft of the machine at a predetermined angular position.

To accomplish this result in a quiet, shockless and positive manner is another object of this invention, and in the form herein shown and described the driven shaft of the machine is first retarded and then stopped after the high speed drive has been disconnected.

This insures a rapid and effectual temporary stop, all momentum being eliminated from the machine prior to the engagement of the low speed drive means.

The low speed drive is preferably a positive one and is so constructed and arranged as to positively turn the shaft to its final stopping position, and then simultaneously goes out of action. V

The invention consists in certain novel features of construction and arrangement of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

It will be understood that while this invention is shown as applied to a well known type of sewing machine, it is obvious that slightchanges in the construction and arrangement of its parts would be possible to adapt it to other classes of machines without departing from the spirit and scopeof the invention.

Of the drawings:

Figure 1, represents in front elevation partly broken away a sufficient portion of a sewing machine to enable this invention to be understood.

Fig. 2, represents a detail to be referred to.

Fig. 3, represents a view of some of the parts looking at the left end of Fig. 1.

Fig. 4, represents a detail of some of the parts shown in Fig. 1.

Fig. 5, represents a section on "the line 5 on Fig. 4.

Fig. 6, represents a section on the line 6-7 on Fig. 1 looking to the left, and

Fig. 7, represents a section on the line 67 on Fig. 1 looking to the right.

Referring to the drawings,

The machine frame 10 of usual or well known construction has journaled therein the shaft 11, having mounted thereon fast and loose pulleys 12-13 adapted to be engaged by the belt 14, see Figs. 1 and 3.

The fast pulley 12 surrounds the hub of a cam or control member 15 which is pinned to the shaft 11 by pin 17 the fast pulley 12 being in turn secured to the said member by the screw 16.

At the right of the cam 15, see Fig. 1, and loose on the shaft 11, is the low speed pulley 18, having movably mounted therein the annular spring pressed clutch member 19,

screws 20 retaining said member 19 in its position against the action of the springs 21.

The annular member 19 is provided with teeth 22 adapted to be engaged by the teeth 23 of a coacting clutch member 24, see Figs. 1 and 7. 1

The clutch member 24 is splined to and slidable on the shaft 11 and is provided with a grooved collar 25 surrounded by 'a loose ring having a stud 26 engaging the upper end of a bell crank lever 27.

A bracket 28 fast to the frame 10 has fulcrumed to it by means of the screw studs 29-29 a rocking lever 30 having an extension 31 to which a treadle or operating link 32 is pivoted.

The link 32 may be connected'to any usual or suitable device convenient to the operator.

' v Slidably mounted in the lever 30 is a 1.10

ings 34-35 forming.

holding the plunger in the position shown in Fig. 3. I

Through the adjusting nut 37 the compression of the spring 38 may be increased or lessened to give greater or less resisting power to the plunger 33' when being depressed by the cam 15 as willbe more fully described. Slidably mounted in bearings 3939 provided in the bracket 28 is a rod or plunger lO'having the end 41 at the bottom thereof and the enlargement. 42 at the top thereof, see Figs. 1 and l.

Near its upper end the said rod passes through an elongated hole 43 in the plate 36. Interposed between the plates 36 and the head llOf the rod 4L0is the spring 44.

Pivoted at 45 to the bracket 28 is a. dog e16, the upper end of which is engaged with the under side of the enlargement: 412 when the machine is running and when in stopped position.

The dog 46 haslaterally extending therefrom the cam surface 47 adapted to be engaged by the hunter screw 48 carried by the plate 36. The enlargement .42 in Figs. 1, 3 and l has pivoted to it. the link 49, said link being. also connected to the arm 50 of the bell crank lever 27.

' The drawings. herewith. show the machine in final stopped position.

Viewing Fig. 3, the lever 30 has an upwardly extended'portion 51 provided with a belt engaging device 52 to be described.

The operation ofthemachine is as fol- 1Q S,-

. T6 start the machine the operator depresses the arm 31 thereby tilting the lever 30 about the. pivots 29 to the right or in the direction ofthe arrow a, see Fig. 1. This movement disengages the upper end of the cam follower 33 from the stop notch 53 formed in the cam 15, see Fig. 1, and at the same timeshifts the belt 14 from the loose pulley 13 to thefast pulley 12..

When. the. said follower has been disengagcdfromthe. notch 53. it will be given a slight upwardm ovementby the spring 38. y This upward movement is limited by the plate 36, meeting the bottom of thebearing 3ilandis sufficient to prevent.- the follower 3.3 trom again entering the notch 53 until the low portion 545'of the cam 15 hasbeen engaged by, it and beendepressed bythe gradualirise of; thesaid cam- .The; shift. above referredto having. been "made the machine willrun at its high speed .which. the rod 40 passes.

until such time as the operator releases the depressed arm 31 when the lever 30. will again attempt to assume anupright position with the follower 33 in position to be operated upon by-the cam 15.

If at this time the low portion 54 of the cam- 15 should register with the follower 33 the follower will assume its operative posi' 7 tion and be depressed by the gradual rise of the cam 15, against the action of the spring 38, the tension or which is sufficient to exert a. braking, action: upon the shaft'11.

It will he understood that the. adjustment of the spring 38 is such as: to cause firsta braking action andthen a stoppage of the shaft 11 in less than a complete revolution thereof. This stoppage ofthe shaft 11 is only a momentary one as will be explained. V

38 will be compressed as the rise of the cam depresses the follower 33 and'attached plate 36 and gradually increases the frictional contact between. the end. of the follower 33- and the periphery of the said cam and exerts a braking action thereupon. that increases until, the final rise 55 reaches the said follower at which. time the shaft 11 will have come to. a rapid yeteasy temporary stop.

The downward movement. of the. follower 33. carries with it. the plate 36 having mounted thereon the hunter screw 4.8 and being provided with an. elongated slot 43" throiigh At approximately the time the rise 55 reaches thefollower 3.3

and prior. to. the actual temporary stoppage of the shaft. lithe hunter screw- 48 will: have contacted withzand' operated upon the cam like extension 47 ofthe dog 16.1novingsaid dog. from underneath. the head 42 of the rod 40, allowing saichrodto. be'forceddownwardly by the. spring 44, as will be 'described.

It will be understood that the adjustment of the screw &8 with relation-to the cam 47 is suchthat on its downward movement with the follower-33"and plate 3.6 thefsaid screw 48 acts on the said came? torelease the dog .46 from beneath the head l2'and will finally accomp ish the release of thefdog 46 from the head 4L2. at. approximately the. time that the follower 3.3."hasrea'chedl the highpart 55 of the. cam. 15' at whichtimethe; compression of the s'p'ring38'issu'fiicient to have caused the. stoppage. of. the sh aft, 1 1".

In other words; the; buntenfscrew. 48.. will have acted'to release the dog at) on the last When the dog 46 has been moved from be neath the head 42 by the bunter screw 48, the compressed spring 44 being freed from restraint forces the rod downward and through the link 49 moves the bell crank lever 27 to the left,.see Fig. 1, the movement of the bell crank lever 27 forcing the teeth 23 of the clutch member 24 into engagement with the teeth of the member 19. It is obvious that the action just described requires an interval of time however short, and during this short interval the shaft 11 is stationary, as the said shaft has lost most of its momentum during the braking action of the follower 33 and consequently when the rise of the cam 15 reaches the follower 33 there is not enough momentum left in the shaft to carry the high part 55 past the follower 33 and the shaft will be stopped during the short interval of time required to position the predetermined slow speed drive means. To prevent shock and rebound of the member 24 at the time of impact between it and the clutch 19, the member 19 is provided with cushion springs 21 which yield slightly as the two members meet.

WVhen the clutch members are in locked positions, the low speed drive will commenee its operation and the shaft 11 will again be started in the direction in which it has been previously driven by the high speed pulley, turning the cam 15 until the notch 53 reaches a position opposite the end of the follower 33, and the compressed spring 38 will then rapidly force the said follower into the notch 33 and cause a positive final stop for the shaft. As previously stated the spring 38 can be regulated so as to cause the temporary stoppage of the shaft 11 when the portion 55 of the cam 15 is just about to contact with the follower 33. It will thus be seen that the low speed drive means is in operation for a short time only, or approximately through 20 degrees of rotation of the shaft 11, which is generally sufficient to turn the cam 15 so that the follower 33 may enter the notch 53 of the said cam. In order to avoid the possibility of the low speed drive being in operation when the final stop occurs, means have been .provided to disengage the low speed drive upon the first part of the upward movement of the follower 33 and said disengagement is actually completed before the said follower reaches its final stopping position notch 53.

Viewing Figs. 1 and 4, the rod 40 is shown as having a collar 40 fast thereon and resting on the top of the plate 36 and through the link 49 and bell crank lever 27 holds the clutch members 1924 out of engagement.

The position of the collar 40 on the rod 40 is such that when the plate 36 has been moved downwardly and the spring 44 has forced the rod 40 downwardly to engage the clutch members 19-24 the said collar 40 will again rest lightly upon the plate 36.

It will thus be seen that the instant the follower 33 and the plate 36 start upwardly toward the final stopping position the rod 40 will simultaneously follow therewith.

As but slight movement of the rod 40 is necessary to disengage the clutch members 1924 it will be completed before the follower 33 has reached the stopping position.

At the latter part of the upward movement of the follower and rod, the dog 46 will be positioned again under the head 42 by the spring S preparatory to another operation.

The clutch member 24 may be adjusted as to its movement to the left, see Fig. 1, by means of the adjustable nut 37 having the cushion washer 56 which limits the downward movement of the rod 40 and the leftward movement of the clutch member 24, and also absorbs the shock of the impact.

An essential feature of this invention is the gradual, and easy stoppage of the driven shaft prior to the engagement of the low speed drive, thereby prohibiting the possi bility of the machine overrunning, which would nullify the work intended. to be performed by the slow speed drive.

From the foregoing, the simplicity of the device and its action will be apparent, and it is believed understood from the description thereof and the accompanying drawmgs.

The above described invention may be stated as consisting of a stop motion. for high speed power driven machines, in which is employed a braking means for reducing the speed of the machine shaft before its final stoppage, in connection with a slow drive means for subsequently driving the shaft by power at the reduced speed toward a predetermined stopping position. The braking means consists of a suitable brake shoe, which does not constitute a part of the slow drive means but is functionally separate or independent therefrom, and the brake does not rotate about the shaft but is in the nature of a simple brake which. is capable of being adjusted to reduce the shaft speed below the speed of the slow drive and, in fact, to a temporary stop so that the slow drive means is compelledv to subsequently in the raise the shaftspeed: when coming into ac tion. The braking means or the slow drive means, or both of them, are preferably automatically timed: in their action by the'shaft itself; Thebrake is an ideal retarding means for a shaft, but, owing to extensive frictional variations, is uncertain in its-action. Therefore, in.- order to insure the full slowing downof the-shaft the brake is preferably adjusted so as to bring it to an easy stoppage, so that the slow drive means has merelythefunction of starting the shaft up at reduced. speed. and oarrylng 1t toward and. substantially to the finalstoppmg. position;

Having thus described my invention, I claim, I

1. In a driving: and stopping mechanism for power driven machines, in combination,

highand low drive mechanisms adapted to operate in the same direction; a driven shaft; means to disengage the. h1gh speed mechanism. from said shaft; means to: stop the; shaft thereafter; and means to. engage the low speed drive aftersaid shaft has been stopped.

2. In a driving and stopping mechanism for power driven machines, in combination, high and low speed. drive mechamsm; a driven shaft; means to. disengage the high speed; mechanism; means to first retard and then stop the shaft after the high speed mechanism has been disengaged; and means to; thereafter engage the low speed drive whereby the shaft will be driven at a low speed in; the same direction.

8. In a. driving and stopping mechanism for power driven machines, in combination, av driven shaft; means todrive, said shaft at different speeds in the same direction; means to change the speed. at which said shaft is to; be driven; and means to stop the shaft intermediate the speed changes.

i. In a driving and: stopping mechanism forpower driven machines, in combination, an operating shaft; high and low speed drive means adapted to operate said shaft in the same direction; means to disengage said, high speed means from said shaft; means coacting with. said shaft to stop it afterthe high speed has been disengaged; and means to thereafter engage said low speed drive means.

5. In. a driving and stopping mechanism for power driven machines, in combination,

high and low speed drive means; a driven shaft; means to disengage the high speed drive means; a stop device coacting with said. shaft adapted-:- tofirst retard and then stop it after the highspeed has been dis engaged; means to engage the low speed driveand operate the shaft, in. the same direction as the high speed. drive;- and means to thereafter stop said shaft at a predetermined-i angular position.

for

6. In a, driving. and stopping mechanism for power drive-n machines, incombination, an. operating shaft; high speed fast and loose pulleys thereon; aconstantly driven low speed pulley loose thereon; driving means. for said high speed, pulley; means to shift said high speed driving means from the high. speed to the loose pulley; means to. stop the. shaft after the said driving means has been shifted; and meansito engage the low. speed pulley with the shaft after the shaft has been stopped.

7.. In a driving and stopping mechanism power driven machines, in combination, an. operating shaft normally adapted to operate in. one direction at different speeds; high speed, fast and loose pulleys thereon; a. belt shiftable from the fast to the loose pulley; a. constantly driven low speed pulley loose onsaid shaft; means to stop the shaft afterthe belt has been shifted from the, said fast pulley to said loose pulley; means to engage the low speed pulley and shaftafter'said shaft has been stopped; and meansto thereafter stop the shaft at a predetermined angular position.

8. In a driving and stopping mechanism for power driven machines, in combination, I

an operating shaft; high and low speed drlve means on said shaft; a stop. cam on said shaft; starting and stopping means coacting with said cam; and means controlled. by said stopping means to engage the low speed drive. I i

9 A stop motion for high speedpower driven machines comprising in combination, means for braking or'reducing the speed of the machine shaftbefore .its final stoppage, such braking meansbcing controlled by the shaft, and a slow, drive means for subsequently driving the shaft by power at a rednced speed toward apredetermined stopping position, said braking means being functionally separate from the slow drive means, and capable of reducing the shaft speed below that of the-slow drive, and the slow drive meansbeing capable of raising the-speed incoming into action.

10; A. stop motion for high speed power driven. machines comprising in combination, means for braking or reducing the speed of the machine shaftand bringing it temporarily to a stop before-its final stoppage, and. a slow drive means for subseqnentlyv driving the shaft by power at a. reduced speed toward a predetermined stopping position, said braking means being functionally separate from the slow drive means. 7 I

11. A stop motion. for high! speed power driven machinescomprising in. combination, l'neans, forbraking or reducing the speed, of

the machineshaft and bringing it temporarily. to. a. stop-before. its: final stoppage, a

slow drive means for subsequently driving llO the shaft by power at a reduced speed toward a predetermined stopping position, said braking means being functionally separate from the slow drive means, and both said means being automatically timed in action by the shaft.

12. A stop motion for high speed power driven machines comprising in combination, means for braking or reducing the speed of the machine shaft before its final stoppage, and a slow drive means for subsequently driving the shaft by power at a reduced speed toward a predetermined stopping position, said braking means being capable of reducing the shaft speed below that of the slow drive, and the slow drive means being capable of raising the speed in coming into action.

13. A stop motion for high speed power driven machines comprising in combination, means for braking or reducing the speed of the machine shaft before its final stoppage, and a slow drive means for subsequently driving the shaft by power at a reduced speed toward a predetermined stopping position, said braking means being arranged to bring the shaft to a temporary stop before the slow drive means comes into action.

14:. A stop motion for high speed power driven machines comprising in combination, a driven shaft; a cam thereon and rotatable therewith having a peripheral notch; a driving member for said cam adapted to be driven at a high speed; a spring actuated stop member coacting with said cam; mechanism on said shaft for actuating said shaft at a slow speed; spring controlled mechanism for actuating said slow speed driving mechanism; a dog for normally retaining said slow speed driving mechanism inactive; and means carried by said stop member for releasing said dog from said slow speed driving mechanism whereby the slow speed driving mechanism may be made active and the shaft driven at a reduced speed until said Copies of this patent may be obtained for stop member enters the cam notch and stops the machine.

15. A stop motion for high speed power driven machines comprising in combination, a driven shaft; a cam thereon and rotatable therewith having a peripheral notch; a driving member for said cam adapted to be driven at a high speed; a spring actuated stop member coacting with said cam; mechanism on said shaft for actuating said shaft at a slow speed; spring controlled mechanism for actuating said slow speed driving mechanism; a dog for normally retaining said slow speed driving mechanism inactive; and an adjustable bunter carried by said stop member for releasing said dog from said slow speed driving mechanism whereby the slow speed driving mechanism may be made active and the shaft driven at a reduced speed until said stop member enters the cam notch and stops the machine.

16. A stop motion for high speed power driven machines comprising in combination, a driven shaft; a cam thereon and rotatable therewith having a peripheral notch and a raised projection adjacent said notch; a driving member for said cam adapted to be driven at a. high speed; a spring actuated stop member coacting with said cam; mechanism on said shaft for actuating said shaft at a slow speed; spring controlled mechanism for actuating said slow speed driving mechanism; a dog for normally retaining said slow speed driving mechanism inactive; and means carried by said stop member for releasing said dog from said slow speed driving mechanism whereby the slow speed driving mechanism may be made active and the shaft driven at a reduced speed until said stop member enters the cam notch and stops the machine.

Signed by me at Boston, Massachusetts, this lath day of August, 1916.

AUGUST R. SCHOENKY.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

